Made in the U.S.A. The 4" diameter VDO Performance Series tachometers have VDO's patented rotating coil movement with electronic circuitry for quick, accurate readings. A light distribution ring ensures bright, balanced lighting at night. The glass lens is distortion-free, a racing-style dial with a fluorescent red pointer and adjustable orange shift indicator, and a 360 degree mounting bracket that lets you rotate the tach for easy viewing. The tachs compatible with most OEM and aftermarket ignitions. For use 2,4,6,8,& 10, and 0-12,000 RPM's. Will not work on 2 stroke snowmobile motors.